Superheater.



' H. SMITH. SUPBRHEAT'HR. APPLIOATIQN FILED'APR. 15, 1911.

z SHEETS-SHEET 1.

,KN mi 1o zoA `HUNTER SMITH, OIE' BERKELEY, CALIFORNIA, ASSIGNOR FTWO'THRDS TO FRANK D.

CHASE, @E4 BERKELEY, CALIFORNIA. Y

SUPERHEATER.

intenso.

Specification of Letters Patent.

Patenten aan. e, i912,

Application ledpril 1,5, 1911. Serial No. 621,359.

To all whomitmay cmicern:` d Be it knownthat l, HUNTER SMITH, a citizenof the Unitedl States, residing .at Berkeley, in the county of .Alamedaand State of California, have invented certain new and usefulImprovements in Super.

heaters, of which the following `is a specification. j

' This invention relates' to steam superheaters 'for boilers and has forits object to providean improved apparatus of kind A tained within alimitedspace.

Referring to the accompanying drawings zF1gure 1 1s an end view of areturn tubular boiler vand a super-heater constructed in accordance withthis invention', partly..

broken .away and in section with theboiler setting in cross section.Fig. 2 is a -side' view in elevation of the super-heater, partly invertical section. Fig. 3 is a side view in elevation of the super-heaterand-the rear of a return tubular boiler with a portion of the boilersetting in longitudinal and Vertical section.v Fig. 4 is a plan View ofthe top 'of one side of the 4super-heater showing. it as partly brokenaway and in honizontal section. Fig. 5 is a plan view in horizontal sec'tion of one of the columns of the superheater. Fig. 6 is a detail viewinve'rtical 'section of a portion of one of the columns of thesuperheater. h

In the accompanying drawings :-1 indicates the rear end of a boiler, and2'indicates the boiler setting in cross section. The super-heater isconstructed withV pairs Vof columns 3 at each side thereof, each pair ofcolumns having a double header@ at the top and a double header 5 vat thebottom. Each of the columns consists of a boiler'l tube 6 expandedatfeach end in theupperand l 'the ends of a boiler tube. 6 'inclosed bya caslng composed of rings lower heads inthe usual manner of securingThe boiler tube 7, preferably of cast meil, whichvrest on one anotherand serve to protect the thin boiler tube 6 rom'rapid destruction byfire,

vfurther has for its objectv only4 parts of the column exposed to thedirect action of the flames, the upper headers and the rest of thesuperstructure hereinafter set forth being outside of the rear archwhile the lower headers and connection are below the pavement of theboiler setting.

j Located Within each boiler `tube 6 is a vertical shaft 8 formed insections 9, each of said sections having a section of a spiral.

flange 10, and connected together k,by means.

of a square verticalprojection 11 lat the top of each section, whichfits into the lsquare socket 12 in the bottom of the section abovel thesa'me. The edges of the spiral bear against the inner sides of the tube.6. The spiral shaft is detachably held in. place by means of a spiderlat each end which has a curved flange 14 Which lits against theexpanded end of the tube (i and the rod 15- eXtends through the sections9 and holds the spiders"y 13 and the shaft in place by means ol2 nuts 16onthe ends-)of the rod 15.

The headers are provided`` with -hand holes closed by a plate 17 havinga stem 17. and a spider 18 secured -'to the stem 17 by soV means of anut 19. A tight jointis formed between the plate 17 and the header by4Fach meansv of a bronze metal' gasket 18V. of the double vheaders isprovided with a lateral projecting lianged,pipef20, the top headers 4Lhaving thedlanged pipes 20 conf neted to/apipe jloint 21 which is formedwith an elbow steam inlet pipe 22 and .an elbow outletpip'e 23, saidinlet pipes being,

separated by partitions 24. The bottom headers 5 are connected togetherby a horizontal pipe 25 located beneath the pavement 26 of the boilersettingmbhevpipe 25. having vits flanged ends connected to the flangedpipes 20 projecting from the bot- .95

tom headers 5', and supported by brackets 27 .on the bottom of theboiler setting.

28 is a connection on the pipe 25 for the attachment of a drip or steamtrap.

One advantage of the construction of each column lies in the fact thatin adapting the super-heater to boilers of any) kind the col` `umn maybemade of any desired length by increasing or` decreasing the number ofsections thereot and the jointed ponnection of the sections 9 of theshaft preserve the alinement of the spiral flange.

The circulation through the super-heater is through the steam inlet 22,and the pipe 2O to the double-header. The flow now div`vides and passesdown through each tube 6 in the spiral path aorded by the flange 10.

From the lower left hand double-header 5 steam passes horizontallythrough the pipe 25 to the right double header 5, and again divides andpasses upward through -'the tubes 6 lto the upper double header'l` andfrom'thence through the pipe 20 and out ofl the outlet 23.

By means of the construction and arrangement of the double columns anddouend to end Jef said sha t, said shaft and spiral flange being formedin sections.

2'. In a steam super-heater for boilers, a column consisting of a boilertube, a header secured to each nd of said tube, a casing inclosing saidtube and formed of a column of detachable metal rings and locatedbetween said headers, a shaft having a spiral'lange extending from endtoendof said tube and formed of detachable sections, a rod eX- tendingthrough said shaft, and a spider on each Vend of said rodfdetaehablySecured thereto, and bearing against the end of the tube.

3. A steam super-heater for boilers, consist'ing of a pair of -columns'at each side thereof, each of said pairs of columns having a doubleheader at the top and bottom, and each of said columns consisting of `aboiler tube, a casing inelosing said tube and lformed oir' built upmetal rings, kand a shaft in said boiler tubehaving a spiral flange,

. the lower double headers being connected by a pipe and one of theupper double 'headers being provided with an inlet pipe and the otherwith an outlet pipe.

In testimony whereof I aitix my signature in presence of two'witnesses.

HUNTER SMXTH. Witnesses: y

F. D. CHASE,

H. C. SCHROEDER.

